Molded Case Circuit Breaker Definition. Moulded case circuit breaker mccb types and working. The traditional molded case circuit breaker uses electromechanical thermal magnetic trip units that may be fixed or interchangeable.
A circuit breaker is a device designed to open and close by nonautomatic means and to open the circuit automatically on a predetermined overcurrent without damage to itself when properly applied within its rating. These breakers are assembled as an integral unit in a supported and enclosed housing of insulating material. This construction limits the amount of airflow through them.
This construction limits the amount of airflow through them.
These breakers are assembled as an integral unit in a supported and enclosed housing of insulating material. Mccb and iccb are almost the same and both are manufactured in accordance to nema ab1 ab3 to suit industrial and commercial purposes. Depending on the amount of protection required these breakers can sense internally and then clear undervoltage overcurrent and short circuit conditions. The term molded case simply refers to the construction of the circuit breaker and refers to the fact that the circuit breaker is an assembled unit in a supporting housing of an insulating material.
